Classical test theory and item response theory pdf

1. What is the difference between classical test theory and item response theory?
2. What are the advantages of item response theory over classical test theory?
3. What is classical response theory?
4. What is classical test theory used for?

What is the difference between classical test theory and item response theory?

The most important difference between CTT and IRT is that in CTT, one uses a common estimate of the measurement precision that is assumed to be equal for all individuals irrespective of their attribute levels. In IRT, however, the measurement precision depends on the latent-attribute value.

What are the advantages of item response theory over classical test theory?

The use of IRT with test development has several advantages over CTT mainly because IRT produces person parameter invariance (test scores are not dependent on the particular choice of test items) when model fit is present, and test information functions provide the amount of information or “measurement precision” ...

What is classical response theory?

Classical Test Theory. Classical test theory is regarded as the “true score theory.” The theory starts from the assumption that systematic effects between responses of examinees are due only to variation in ability of interest.

What is classical test theory used for?

Classical Test Theory (CTT) has been developed to quantify measurement error and to solve related problems such as correcting observed dependencies between variables (e.g., correlations) for the attenuation due to measurement errors. Basic concepts of CTT are true score and measurement error variables.